Expert Review Panel for Kombucha Tea
AOAC SPDS ERP REVIEW: MAIN FORM
Submission Date
2017-09-18 09:24:21
Name
Armen Mirzoian
armen.mirzoian@ttb.gov
Organization
TTB
Title of Method
Determination of Ethanol in Kombucha by GC-FID
AOAC Candidate Method Number (e.g. ALN-01)
KOM-4
Applicable SMPR
2016.001
Summary:
The method measures concentration of ethanol in Kombucha by liquid injection GC- FID using 2-propanol as internal standard
1. Does the applicability of the method support the applicability of the SMPR? If not, please explain what is missing. 2. Does the analytical technique(s) used in the method meet the SMPR? If not, please specify how it differs from what is stated in the SMPR. 3. Are the definitions specified in the SMPR used and applied appropriately in the method? If no, please indicate how the terms are used. 4. Does the method, as written, contain all appropriate precautions and warnings related to the method's reagents, components, instrumentation, or method steps that may be hazardous? If no, please suggest wording or option(s). 1. Are the definitions specified in the SMPR used and applied appropriately in the supporting documentation (manuscripts, method studies, etc...)? If not, please explain the differences and if the method is impacted by the difference.
Generally it does, however it's not clear how are the LOQ and LOD evaluated.
No 1. Since determination of LOQ and LOD is not described, it is not clear whether they meet SMPR. 2. Recoveries for ethanol concentrations below 0.5% abv were not determined 3. Repeatability of the method (presented as Precision) exceeds 4% 4. Reproducibility was not determined
1. LOQ and LOD are neither defined nor evaluated. 2. Spike recovery determination is incomplete 3. Precision is only expressed as repeatability 4. Reproducibility was not determined
yes
Same as II.3. 1. LOQ and LOD are neither defined nor evaluated. 2. Spike recovery determination is incomplete 3. Precision is only expressed as repeatability 4. Reproducibility was not determined
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